4. Functional safety engineering
Festo P.BE-CMMS-AS-HW-EN en 0708NH 75
Fig. 4.1 "Safe standstill" block schematic as per EN 954-1 Category 3
Caution
If the "Safe standstill" function is not required, then pins 1 and 2 of
[X3] must be bridged.
For "Safe standstill" as per EN 954-1 Category 3, a second channel is required, i.e. motion
must be reliably prevented via two separate, completely independent paths. These two
paths for interrupting the energy supply supply to the drive with the reliable impulse block,
are called switch-off paths:
End stage enable via [X1] (blocking of the PWM signals; the IGBT
drivers no longer receive pulse patterns).
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